print(STDERR"Usage: node_reboot [-d] [-f] [-w] [-k] node [node ...]\n"." node_reboot [-d] [-f] [-w] [-k] -e pid,eid\n"."Use the -d option to turn on debugging\n"."Use the -e option to reboot all the nodes in an experiment\n"."Use the -w option to to wait for nodes is come back up\n"."Use the -k option to power cycle nodes in PXEWAIT mode\n"."Use the -a option to reboot all free nodes\n"."Use the -c option to reconfig nodes instead of rebooting\n"."Use the -f option to power cycle (and not wait for nodes to die)\n");